assume cs:code ds:data
data segment
   ; db 'unix'
   ; db 'hello'
    data ends
code segment
    start:
    ;mov al,'a'
    ;mov bl,'b'
    ;
    mov ax,01h
    mov ds,ax
    mov bx,010h
    mov ax,cs:[bx+20]
    mov ax,4c00h 
    int 21h
    code ends
end start